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(No Model.) 2 Sheets-Sheet 1.

H. STBNZ 8v G. WESTERMANN. RADIATOR ATTACHMENT FOR ARC LAMPS.

(No Model.) 2 Sheets-Sheet 2,

H. STENZ 8v G. WESTERMANN. RADIATOR ATTACHMENT FOR ARG LAMPS.

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HENRY STENZ AND GEORGE WESTERMANN, OF FARIBAULT, MINNESOTA,

ASSIGNORS TO THE SHADOVLESS RADIATOR MANUFACTURING OOM- PANY, OF SAME PLACE.

RADlATOR ATTACHMENT FOR ARCHLAVIIPS.

SPECIFICATION forming part ot' Letters Patent No. 599,519, dated February 22, 1898.

Application led November 30, 1896. Serial No. 613,980. (No modell) To @ZZ whom t may concern:

Be it'known that we, HENRY STENZ and GEORGE WEsTERMANN, citizens of the United States, residing at Faribault, in the county of Rice and State of Minnesota, have invented a new and useful Radiator Attachment for Arc-Lamps, of which the following is a speciiication.

rThis invention relates to arc-lamps; and it has for its object to provide a new and useful attachment for lamps of this character having means for securing a uniform radiation or diffusion of the light, so as to increase the brilliancy thereof, while at the same time being especially designed for the purpose of obviating or diminishing the shadow cast by the side bars of the lamp-frame, which shadow is an objectionable feature of arc-lamps now in use.

lVith these and other objects in view, which will readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts hereinafter more fully described, illustrated, and claimed.

In the drawings, Figure l is a perspective view of an arc-lamp iitted with one form of the herein-described invention. Fig. 2 is a detail in perspective of one of the segmental radiator attachments removed from the lampframe. Fig. 3 is a vertical sectional view of the construction illustrated in Fig. 2. Fig. t is a cross-sectional view on the line 4t d of Fig. 3. Fig. 5 is a view similar to Fig. l, showing a circular or cylindrical form of the attachment employed as a substitute for the ordinary arc-light globe. Fig. G is a vertical sectional view of the form of attachment illustrated in Fig. 5. Fig. 7 is a cross-sectional view of the circular or cylindrical form of the attachment. Fig. 8 is a top plan view thereof.

Referring to the accompanying drawings, it will be seen by reference to Figs. l to 4E, inclusive, that these figures of the drawings illustrate one form of the radiator attachment, which, while serving to secure a uniform radiation or diffusion of the light, is primarily designed to so diffuse the light as to obviate a shadow being cast by the side bars of the lamp-frame, and in this form of the attachment the radiator is used in conjunction with the usual lamp-globe (not shown) and occupies a position interposed between the light and the side bars of the lamp-frame.

Referring particularly t-o Figs. l to 4:, inclusive, the numeral l designates an arclamp of any approved form, having the usual carbons 2, and the frame thereof essentially comprising the loppositely-located parallel side bars or rods 4, and in Fig. l of the drawings the usual globe of the lamp is omitted, so as to expose to view the proper relative position of the oppositely-located radiator attachments for the opposite side bars 4t of the lamp-frame. Each of the oppositely-located radiator attachments (designated by the numeral 5) essentially comprises a pair of spaced upper and lower frame-plates Gand a plurality of solid glass rods 7, arranged closely together between the oppositely-located framevplates and forming a solid transparent lightradiating body. The oppositely-located upper and lower frame-plates 6 are provided in their inner faces with the segmental grooves 8, receiving the ends of the glass rods 7, so as to hold the rods disposed in the same circular plane and thereby produce a light-radiating body concavo-convex in cross-section, with corrugated conveXed and concaved surfaces, it being observed that the rods are arranged closely together and in parallel vertical planes, so as to leave no space between their adjacent faces through which the light can shine.

The upper and lower frame-plates 6 of the attachment are somewhat triangular in form and project laterally beyond the conveXed side of the radiating-body and have formed in such laterally-projected portions the rodopenings 9, receiving the opposite bolt ends 10 of a tie-rod l1, connecting the two plates, and which when tightened at its bolt ends serves to tightly clamp the plates onto the ends of the glass rods, so as to hold such rods rigidly in place and form the light-radiating body. The frame-plates 6 are provided at their outer corners or edges with the restnotches 12, forming projections which engage against the side bars 4 of the lamp-frame to hold the radiator attachment in a plane parallel with the side bar of the frame and between such sidebar and the arc-light, and to provide for detachably securing the attachment in this position attaching-wires 13 may be conveniently employed, which wires are strung through wire-openin gs 14 in the plates 6 and are adapted to be twisted around the frame side bar 4 to which the attachment is tted.

It will of course be understood that a separate one of the attachments described is arranged at each side of the arc-light and is secured to each ofthe side frame bars or rods 4 at the inner sides of the said side bars to provide for intercepting the light and radiating or diffusing the same in such a manner as to obviate the casting of a shadow by the said side frame bars.

It will beobserved that when the radiator attachments are positioned as described the inner corrugated concaved surfaces of the radiating-bodies are disposed next to the light and have somewhat of a prismatic effect, causing the light to be widely radiated and evenly diffused without the casting of any shadows.

A modified form of the attachment is illustrated in Figs. 5 to 8 of the drawings, in which form of the attachment the solid transparent light-radiating body is formed by a continuous circular series of the solid glass rods 7, arranged closely together in the same circular plane and in parallel vertical planes to produce a complete circular or cylindrical radiating-body that is designed to entirely encircle the carbons of the lamp, and thereby dispense with the use of the ordinarylamp-globe. In the modified form of the attachment having a complete circular or cylindrical lightradiating body the rods 7 are arranged between a pair of spaced upper and lower circular frame-plates 15 in the form of rings and provided in their inner faces with the circular or annular grooves 16, receiving the ends of the rods 7 to hold the same properly in position, so as to produce a solid light-radiating body of the form described, and the said opposite circular frame-plates 15 are provided with laterally-proj ected vertically-alined perforated ears 17 which are connected by the tie-rods18,having bolt ends 19, engagingwith the ears 17, whereby the opposite frameplates 15 may be drawn tightly together onto the ends of the continuous circular series of the rods 7. The circular frame-plates l5,

ows from parts of the frame adjacent to the light.

The oppositely-located frame-plates 15 of the circular or cylindrical form of the attachment are provided at diametrically opposite edges with the offstanding stop-lugs 20, adapted to rest against one side of the opposite frame side bars 4 when the attachment is placed between such side bars, and arranged on the uppermost frame-plate 15, so as to work directly above the stop-lugs 2O thereof, is a pair of diametrically opposite catchdogs 21. The diametrically opposite catchdogs 21 are provided at their inner ends with the pivot-tongues 22, pivotally mounted between the ears 23, projected from the said upper frame-plate 15, and on their upper sides the said catch-dogs 21 are formed with finger projections 24, whereby the dogs may be readily manipulated. The said catch-dogs 2l are provided with bifurcated or forked outer ends 25,adapted to frictionally embrace the inner sides of the frame side bars 4, so as to hold the attachment properly in place, it being observed that the stop-lugs 2O for the upper frame-plate 15 are disposed at one side of the bifurcations or forks 25 of the said dogs 2l. After the cylindrical form of the attachment is inserted in place between the framebars 4 the catch-dogs 21 are forced down against the said bars 4, so as to rigidly fasten the radiator attachment in position. When trimming the carbons, the catches 21 are raised, so as to permit of the attachment being slid in an upward direction, after which the said catches are again forced into binding engagement with the bars 4, so as to secure the attachment in its elevated position until the trimming is linished. For cleaning the cylindrical form of the attachment the dogs 21 are thrown entirely out of the way, thereby permitting the attachment to be moved laterally from between the side bars of the frame.

In the cylindrical form of the attachment just described the closely-contacting solid glass rods form a light-radiating body having corrugated concaved and conveXed surfaces, with the corrugated concaved surface disposed next to the light to secure the proper radiation or diffusion thereof.

While the light-radiating body has been described as being preferably formed of a plurality of solid glass rods, which are easily replaceable when broken, still it will be understood that such body may be formed of a single casting of glass having the same corrugated conformation as the rod-body and thereby necessarily attainingthe same results. Y

Other changes in the form, proportion, and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described the invention, what IOO IIO

is claimed, and desired to be secured by Letters Patent, is-

l. A radiator attachment for arc-lamps comprising a pair of oppositely-located frameplates having grooves in their inner faces, and projections at their edges adapted to engage the adjacent side bar of the lamp-frame, an adjustable tie-rod connection between the two plates, a plurality of vertical glass rods arranged side by side in the same circular plane and having their inner ends fitting the grooves of the frame-plates, and fastening means for securing the attachment to the lamp-frame, substantially as set forth.

2. A radiator attachment forarc-lamps,com prising a pair of oppositely-located adjustably-connected circular frame-plates having grooves in their inner faces, a continuous circular series of solid glass rods arranged closely together With their ends fitting in the grooves of said plates, and movable catches mounted on one of said frame-plates and adapted to be moved in and out of engagement With the side bars of the lamp-frame, substantially as set forth.

3. A radiator attachment for arc-lamps com- 

